Factor out reporting from rules

lib/src/checker/checker.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dev_compiler.src.checker.checker;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/scanner.dart' show Token, TokenType;
@@ skipping 329 matching lines @@
   bool _constantContext = false;
   bool _failure = false;
   bool get failure => _failure || _overrideChecker._failure;
 
   CodeChecker(
       TypeRules rules, CheckerReporter reporter, CompilerOptions options)
       : _rules = rules,
         _reporter = reporter,
         _overrideChecker = new _OverrideChecker(rules, reporter, options);
 
+  @override
+  visitCompilationUnit(CompilationUnit unit) {
+    void report(Expression expr) {
+      _reporter.log(new MissingTypeError(expr));
+    }
+    var callback = _rules.reportMissingType;
+    _rules.reportMissingType = report;
+    unit.visitChildren(this);
+    _rules.reportMissingType = callback;
+  }
+
   _visitMaybeConst(AstNode n, visitNode(AstNode n)) {
     var o = _constantContext;
     if (!o) {
       if (n is VariableDeclarationList) {
         _constantContext = o || n.isConst;
       } else if (n is VariableDeclaration) {
         _constantContext = o || n.isConst;
       } else if (n is FormalParameter) {
         _constantContext = o || n.isConst;
       } else if (n is InstanceCreationExpression) {
@@ skipping 432 matching lines @@
   void _recordDynamicInvoke(AstNode node) {
     _reporter.log(new DynamicInvoke(_rules, node));
   }
 
   void _recordMessage(StaticInfo info) {
     if (info == null) return;
     if (info.level >= logger.Level.SEVERE) _failure = true;
     _reporter.log(info);
   }
 }